The Ram 3500 uses different oils depending on the engine and year. In general, diesel-equipped Rams with the 6.7L Cummins require a heavy‑duty diesel oil such as 15W‑40 that meets API CK‑4, while gasoline models (5.7L or 6.4L Hemi) use a lighter synthetic grade, typically 5W‑20 or 0W‑20. Always confirm the exact specification in the owner's manual or with a Ram dealer for your exact year and engine.
The Ram 3500 is offered with both gasoline and diesel powertrains. Oil requirements are tied to the engine design, emissions equipment, and model year, and they can change as manufacturers update specifications. For the most accurate guidance, consult your manual, the under-hood oil cap sticker, or your dealer, especially if you are handling extreme temperatures or heavy-duty use.
Oil recommendations by Ram 3500 engine
Below are the typical guidelines by engine type to help you identify the right grade.
- Gasoline engines (5.7L Hemi, 6.4L Hemi): Use full-synthetic motor oil with a viscosity of 5W‑20 or 0W‑20, as recommended in your manual. Climate and usage can influence the exact grade, so verify for your vehicle.
- Diesel engines (6.7L Cummins): Use heavy-duty diesel oil, typically 15W‑40, meeting the API CK‑4 specification (or newer CK‑4/SN). Depending on the model year and climate, some owners may use 5W‑40 CK‑4/SN, but your manual will give the definitive requirement.
Always reference the exact grade and specification listed for your truck in the owner's manual and follow the recommended oil change intervals for your engine and usage profile.
How to verify the exact specification for your truck
If you’re unsure which oil to buy, here are reliable ways to confirm the right specification.
- Check the owner’s manual, which specifies the correct viscosity and API/ILSAC or CK‑4/SP specification for your engine and year.
- Look under the hood for an oil-cap label or a sticker on the underside of the hood listing the recommended viscosity and spec.
- Use Ram’s official website or contact a dealer with your VIN to pull the exact specification for your specific truck configuration.
Following these steps ensures you use the correct oil grade and specification, preserving engine health and warranty coverage.
Summary
In short, the Ram 3500’s oil type depends on the engine: diesels (6.7L Cummins) typically require 15W‑40 API CK‑4, while gasoline versions (5.7L/6.4L Hemi) usually use 5W‑20 or 0W‑20 synthetic. Always verify with the owner's manual, the under-hood sticker, or a dealer for your exact year and engine. If you provide your model year and engine, I can pinpoint the precise oil specification for you.